Gnathodentex aureolineatus (Lacepede, 1802)
Common in the Solitary Islands Marine Park. Widespread tropical Indo-Pacific. In Australia recorded from Western Australia, Queensland south to northern New South Wales. Also reported from Norfolk Island.
Frequents offshore islands, reefs and lagoons to 30m.
Colour may be variable according to habitat but yellow patch below rear of dorsal fin is constant. Usually found in small schools, occasionally up to several hundred individuals. Nocturnal predator, feeding on small molluscs, crabs and other crustaceans. Grows to 30cm.